Boiler



Dec. 12, 1939. w. ROBITZEK El" AL BOILER Filed March 8, 1939 2 Sheets-Sheet 1 m y la. m RN .Q mw mm, m3 wm m P Q hwfi MM.

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Leonard J. Bach/er INVENTORS /z mi ma,

ATTORNEY.

Dec. 12, 1939. w. ROIBITZEK ET AL BOILER Filed March 8, 1939 2 SheetsSheet 2 Will/am Robhzek Leonardd Bach/er ATTORNEY;

I Patented Dec 12,1939

BOILER William .R-obitzek, City Island, and than .1.

Bachler; -New York, N. Y.

Application- March s, 1939, Serial No. 260,474-

, I a v I 21Claims.' (01. 122- 751) I This invention relates vto boilers especial-ly of the down and cross draft type. J a a l vIt is the principal object to provide .sulc'h' a I boiler-made-ofa unitary structure which can'be' manufactured economically.

=Another object is-to provide a 'boiler of this .-kind.in which there areno caulked iioints neces- -sary andin which all joints are welded to .iorm

asingle main structure.

, A further object is to eliminate any moving -parts such as blowers, fans and the like and so [relation ;to the fire box or combustion chamber,-

ldispose'the combustion-space with respect to the air.,inlets that very fine fnel' such as buclwvheat 'coal may be used.

a A; still further object is, by the disposition of the'water tubes and water legs :of the ibOi'lEY- in to obtain a maximum heating efficiency and utilize 'tO",l3h-.f-.tl11BSt extent all available heatingunits. I I 7 Still another object is to .combine "the .usual separate ash pit with the main boiler :in one unit and to make provision for the use :of flooring for the ash pit in installation where no foundation has been arranged. for.

Other objects will become apparent in thefollowing specification. and the accompanying drawl ingsin which Fig. :1 isza vertical cross sectional view through a boiler embodying the principles of the i-nven tion; v Fig. 2 is a longitudinal section'along' the-plane ofline,22 in Fig. 1; and I I Fig-3 is, a sectional view similar to Fig. l but having duplicate coal charging and storing facilities;

lar parts throughout the several views.

The drawings are shown more or less diagrammatically and those accessories appertaining to 7 I boilers and well known in the art omitted in part.

I In-Figs. l and. 2, I is a shell substantiallyovat 1 shaped in cross section defining a water chamber 3 ll having a front wall !Z, a rear wall l3, atopv wall M and a bottom wall l5. Extending longitudinally along the bottom wall l of. the shell l; projecting downwardly therefrom andv in spaced relation to its side wall is another wall 96 forming a water leggi'i. l8 are a series of oblique I "water tubes, oval in cross sectionv and 'close to each other, connecting the lower partof the Wa ter leg 'l with the'lower part of. the water cliam- 1 her.

Atthe side of th shell in opposite to the water i and 36.

have been t ively laid upon flanges 450M116 walls l2, [3, I6

'leg'll isan outer chamber or magazine is de- I fined by wall 2 having a cover 21, and an obliquely downwardlyextending side wall 22 23 is an airyinlet 'contre'iled by a suitable damper 2d,

1 and 1%5 "ma-continuation of the outer wall- 29 to the floor flinel "Similarly the outer wall of the shell it; alongside the water leg ll continued {downwardly to-the floor line.

26 are" bottom grates, slightly inclined in spaced relation to the floor lineandformin-g an ash pit 2'5 therewith and extending from the bottom oflthe water leg ii tothe outer wa=1l'25. The

bottom" grates are connected *bysuitable means andladapted to be operated for shak ng pur- Hp'oses' -in the usual and well knownmanner 28' is an ash pit door. 29 is a series of. 121*.

clined vertical grates connected'at their tops 30 .tothe-wall 22 adjacent the air opening -23 and terminating"immediately above the bottom grates inspacedrelation to the outer wall forming an-air chamber '3! therewith. 52 are spacing bars attached to'the grates to fix their position I rea-r'of the chamber disposed between rearwall 13011 shell and a recess formed by Walls 35 The frontwall'fl or the shell am is provided wit-ha cleaneoutchambertl having a clean-out door 38' of the usual olesign. 'The rear wall i3 is provided withasmoke box '39 having the usual stack connection' lll-and dam per 41.

'42' area series of short fire tubes connecting the supplementary combustion-chamber 34 with the clean-out chamber 31, and 43 are a series of long fire tubes connecting the clean-out chamber 31 with the smoke box 39.

44 is a cast iron bottom plate fastened, respecand forming the ash pit-21.

The entire structure with exception of the grates, floor plate,- doors, dampers and other customary accessories, some of which arenot shown,

is'made of a single sheet of metal welded to- .gether, thus avoiding all'caulked or screwed joints. j i

The operation of the boiler is as follows: After an initial fire'has been built upon the bottom grates 2B in the combustion chamber 33,

the magazine I9 is charged with coal which ignited fills the combustion chamber :33 surrounding the small'water tubes I8 and contacts it; bottom with the lower part of the water leg l1. Air is drawn in through the inlet 23 and the vertical grates 29, as well as through the. bottom grates 26 by the draft from the stack.

The gases of combustion are drawn first through the short fire tubes 42 into the clean-out chamber 31 and thence through the long fire tubes 43 into the smoke box. and the stack.

Because only a single thickness of metal is interposed between the combustion chamber and the water in the water leg and tubes as well as the bottom of the water chamber, the water contained therein is quickly heated. The products of combustion or gases, also being separated from the water while travelling through the fire tubes by only a single thickness of metal, give up their maximum heat values to the water whereby a relatively high boiler eificiency is obtained.

In the modification illustrated in Fig. 3, the coal magazine is duplicated, that is, a magazine is provided for at both sides of the main shell. The same characters of reference are used as in Figs. 1 and 2. The details of construction and description of operation are identical therewith.

The double magazine is especially provided for on boilers for larger buildings and where there fore greater coal reservoirs are of advantage.

The floor plate at the bottom of the ash pit is optional and may be used particularly whereno foundation has been prepared for the boiler and where preferably a completely self-contained unit is to be installed.

A boiler made according to the principles of this invention may be assembled, exclusive of its accessories, and moved directly to the job because of its appreciably lesser weight than boilers as made heretofore in sections and of heavier metal. Q a

While we have shown in the drawings several preferred embodiments of the invention, it, is understood that various changes in the form, proportion and minor details of construction may be resorted to without departing from the principles or sacrificing any of the advantages of the invention, as defined in the appended claims.

What we claim as new is:

1. A boiler of the down and cross draft typ consisting of a casing having a water chamber at its top, a Water leg at one side thereof downwardly extending therefrom, a series of inclined Water tubes connecting the lower part of the said water leg to the bottom of the said water chamber at the other side thereof, a fuel reservoir alongside said other side of the chamber having a charging inlet at its top and an air inlet at its side, the outer Walls of the said casing extending to the floor, short fire tubes and long return fire tubes through the said water chamber and in communication with each other and a combustion chamber within the casing below the said water chamber, the said casing having a stack outlet in communication with the said return fire tubes, all formed in a unitary structure of sheet metal having welded joints, a series of bottom grates in spaced relation to the floor extending laterally between the bottom of the water leg and the opposite outer wall of the casing, and a series of vertical grates in spaced relation to the said last mentioned outer wall and defining an air chamber therewith extending from adjacent the said air inlet to the said bottom grates, the outer walls of the said fuel reservoir and the said air chamber being a continuous sheet of metal and part of the said outer walls of the casing.

2. A boiler of the down and cross draft type consisting of a casing having a water chamber at its top, a water leg at one side thereof downwardly, extending therefrom, a series of inclined water tubes connecting the lower part of the said water leg to the bottom of the said water chamber at the other side thereof, a fuel reservoir alongside said other side of the chamber having a charging inlet at its top and an air inlet at its side, the outer walls of the said casing extending to and being inwardly flanged at the fioor, short fire tubes and long return fire tubes through the said water chamber and in communication with each other and a combustion chamber defined by the said outer walls of the casing below the said water chamber, the said casing having a stack outlet in communication .with the said return fire tubes, all formed in a unitary structure of sheet metal having welded joints, a series of bottom grates in spaced relation to the floor extending laterally between the bottom of the water leg and the opposite outer wall of the casingforming an ash pit withthe floor, a series of vertical grates in spaced relation to the said last mentioned outer wall and defining an air chamber therewith extending from adjacent the said air inlet to thesaid bottom rates, the outer walls of the said fuel reservoir and the said air chamber being a continuous sheet of metal and part of the said outer walls of the casing, and a removable floor plate adapted to rest upon the said inwardly flanged outer walls of the casing.

WILLIAM ROBITZEK. LEONARD J. BACHLER. 

